Pulverizer.



H; J. SHELTON.

PULVERIZER.

APPLICATION FIILED NOV. 4, 1918.

l @QEEEQ Patented Apr. 29,1919.

HARRY J. SHELTON, 0E ST. LOUIS, MISSOURI.

PULVERIZER.

Specification of Letters Patent.

Patented Apr. 29 1919.

Application filed November 4., 1918. Serial No. 261,104.

To all whom it may concern:

Be it known that I, HARRY J. SHELTON, a citizen of the United States, residing in the city of St. Louis, in the State of Missouri, have invented a new and useful Improvement in Pulverizers, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, which form a art thereof.

My invention re ates to pulverizers in which the substance to be pulverized is broken and crushed by means of revolving hammers, and my invention relates especially to pulverizers used for grinding and pulverizing such materials as screenings, middlings, chafi, and other similar products in which there are likely to be small particles of wire, pebbles, or nails which must be removed from the material.

The object of my invention is to provide a pulverizing machine that will be equipped with a device whereby small stonesor gravel, pieces of wire, nails or similar articles which may find their way into the pulverizer with the material to be pulverized will be separated from the material so that they will not injure the machine and will be deposited in a receptacle from which they may be easily removed.

My invention is fully shown in the accompanying drawings, where Figure 1 1s a vertical section at right angles to the axis of the machine; and Fig. 2 is a section on the line 2-2 of Fig. 1.

Referring to the figures, 1 is a housing in which the working parts of the machine are inclosed. 2 is a rotor mounted on the shaft 3 and provided with a plurality of hammers 6', which are, preferably, pivotally connected to the rotor 2 by means of pins 7. The shaft 3 is supported at each end in a suitable bearing l, which lies outside of the housing. The shaft 3 is made to revolve by means of a belt, not shown, adapted to run on the pulley 5. 8 is the wall of the grinding surface which occupies nearly the whole 'of the upper half of the space inside the housing, and which is provided with-corrugations or teeth on'its inside surface very close to the outer ends of the hammers 7. This grinding surface of the wall 8, as shown in Fig. 1, is of a circular shape so as to fit close to the outer ends of the hammer. 9 is a screen which is circular in cross-section, as shown in Fig. 1, through which the pulverized material passes into the space inside the housing below the screen, from where the material is drawn away through suitable pipes or ducts, not shown, usually by means of a suction fan, not shown. 10 is the inlet pipe or supply hopper through which the materlal to be pulverized is introduced into the apparatus. The material-passes from the hopper 10 through the inlet opening 11 formed in the wall 8. The inlet opening 11 1s preferably formed, as shown in Fig. 1, about mid-way of that quadrant of the wall 8 along which the hammers move downwardly. 12 is a pocket formed outside of the lower part of the quadrant in which the inlet opening 11 is formed. This pocket is preferably formed between the outer surface of the wall Sand the inner surface of the walls of the hopper 10.

The cereal, bran or other material to be pulverized is supplied through the hopper 10, and it falls through the inlet opening 11 into the interior of the machine, where it comes in contact with the fast revolving hammers 6 and is beaten and ground between these hammers andthe teeth of the wall 8 so that the material is pulverized and reduced to the required degree of fineness. As the pulverized material is moved over the screen 9 the fine articles pass there'- through and then are drawn outside of the housing. When pieces of wire, gravel or nails, are fed from the hopper into the machine, these pieces are struck by the hammers and either'thrown back into the hopper, or carried around b means of the ham-' mers until they reach t e inlet opening 11, and then they pass through this opening into the hopper. When the pieces of wire, gravel, nails, or other substances are thrown by means of the hammers back into the hopper 10 they fall into the pocket 12 and are there caught and retained. This pocket 12 in a very short time becomes filled with fine material and the hard substances thrown out by the hammers fall into this soft material and becomes embedded therein and thus are retained.

It will be noticedthat in the machine shown in the drawings the upper part of the housing is hinged at 13 to the lower part, and the two parts are held together by means of the bolt 14%. When it-is desired to empty the pocket 12 the bolt 1% is removed and the upper part of the housing raised so as to allow whatever is in the pocket 12 to be removed therefrom.

It is evident that the size and the shape of the pocket 12 may be varied as desired, and also that the method herein provided for emptying the pocket 12 may be changed without departing from the spirit of my invention. 1

What I claim as new and desire to secure by Letters Patent, is:

1. A. pulverizer having a grinding chanlv her with revolving hammers and an inlet duct, and a pocket for foreign material, the

said pocket being formed by and between the adjacent walls of the sald chamber and said inlet duct, and opening upwardly directly into the latter.

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2. In a pulverizer having a grinding chamber with revoluble hammers mounted therein and having an inlet opening in the Wall thereof formed so that said hammers move across-said opening from the upper toward the lower edges thereof, and a supply duct leading to said inlet opening and having one of its walls spaced from that part of the wall of the grinding chamber which lies below said inlet opening so as to form between them a pocket in said supply duct adjacent to said inlet opening.

In witness whereof I have signed my name to this specification.

HARRY J. SHELTON. 

